linux-kernel - Re: [PATCH 1/3] tmpfs: revert SEEK_DATA and SEEK

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Date:	Wed, 11 Jul 2012 11:55:34 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] tmpfs: revert SEEK_DATA and SEEK_HOLE

On Wed, 11 Jul 2012, Cong Wang wrote:
> On Mon, 09 Jul 2012 at 22:41 GMT, Hugh Dickins <hughd@...gle.com> wrote:
> > Revert 4fb5ef089b28 ("tmpfs: support SEEK_DATA and SEEK_HOLE").
> > I believe it's correct, and it's been nice to have from rc1 to rc6;
> > but as the original commit said:
> >
> > I don't know who actually uses SEEK_DATA or SEEK_HOLE, and whether it
> > would be of any use to them on tmpfs.  This code adds 92 lines and 752
> > bytes on x86_64 - is that bloat or worthwhile?
> 
> 
> I don't think 752 bytes matter much, especially for x86_64.
> 
> >
> > Nobody asked for it, so I conclude that it's bloat: let's revert tmpfs
> > to the dumb generic support for v3.5.  We can always reinstate it later
> > if useful, and anyone needing it in a hurry can just get it out of git.
> >
> 
> If you don't have burden to maintain it, I'd prefer to leave as it is,
> I don't think 752-bytes is the reason we revert it.

Thank you, your vote has been counted ;)
and I'll be glad if yours stimulates some agreement or disagreement.

But your vote would count for a lot more if you know of some app which
would really benefit from this functionality in tmpfs: I've heard of none.

Hugh
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